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Preparation

Preheat oven to 350 degrees. Have a 13"x9" pan ready.
Put first four ingredients of topping in a food processor; process to blend. Cut butter into 1/2" cubes, add to food processor; pulse until mixture resembles coarse crumbs. With processor running, drizzle in water. Put resulting dough in a container and refrigerate.
Next put first 4 ingredients of shortbread base into the food processor; process to blend. Cut butter into 1/2" cubes, add to processor; pulse until mixture resembles coarse crumbs. Press crumbs into 13"x9" pan to evenly cover the bottom. Bake crust for 20 minutes, or until lightly golden.
Spread jam on hot crust. Get topping out and grate or crumble over the jam to create a fairly even topping.
Return pan to oven for 20 minutes, or until topping is set.